BTS = input().split()
jeonguk = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine']
shaman = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
chis = []
DEAD666 = [101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997]
   
if len(BTS)!=3 or BTS[0]=='zero':
    print('Wrong input')

else:
    for abracadabra in range(0, len(BTS)):
        if BTS[abracadabra] not in jeonguk:
            print('Wrong input')
            break
    for paradise in BTS:
        chis.append(shaman[jeonguk.index(paradise)])
    chis = int(''.join(chis))
    if chis in DEAD666:
        print(chis)
    else:
        DEAD666.append(chis)
        DEAD666.sort()
        Taganrok = DEAD666[DEAD666.index(chis)+1]
        Temryk = DEAD666[DEAD666.index(chis)-1]
        if Taganrok-chis<chis-Temryk:
            print(Taganrok)
        elif Taganrok-chis>chis-Temryk:
            print(Temryk)
        elif Taganrok-chis==chis-Temryk:
            print(Temryk)
